Low headroom transfer chute for underground belt conveyors: analysis of coal flow through ninety degree transfer point and preliminary design. Final technical report, July 1976--April 1977
A study program combining computer math modeling and scale model tests has evolved a preliminary design for a 90-degree transfer chute for belt conveyors in underground coal mines. The principal design objective was to achieve chute flow characteristics that minimize coal spillage, dust generation, and belt wear. This preliminary design will serve as a conceptual baseline for detailed design, fabrication, and testing--both above ground and in a coal mine--of a full size, 90-degree transfer chute between a 36-inch wide, input belt conveyor and a 42-inch wide, receiving belt conveyor. The study concludes that a double curvature-type surface wil most nearly achieve the performance objectives for the 90 degree belt transfer chute. The surface recommended for full scale above-ground testing resembles a portion of a 90 degree smoke pipe elbow, corresponding to a jointed approximation of a basic torus geometry. For the 36 inch wide belt, 450 fpm, feed conveyor case, the torus has a 36-inch major radius and an 18 inch minor radius. Work performed under this study includes: (1) technology surveys of transfer point design, bulk flow theory, and underground coal mine operations; (2) math modeling and associated computer programming of free fall, impact, and frictional flow dynamics; (3) evolution and evaluation of several candidate chute geometries; (4) construction and laboratory testing of one-sixth scale models; and (5) preliminary design of the recommended chute.
- Research Organization:
- Fairchild Space and Electronics Co., Germantown, MD (USA)
- DOE Contract Number:
- ET-78-X-01-2415
- OSTI ID:
- 6155191
- Report Number(s):
- FE-2415-1
- Country of Publication:
- United States
- Language:
- English
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